Round 2 of extensive_testing on 548d99a found no exploitable defect --
has_block's "contains, not is" semantics are shared with minimax_h3's
own equally consequential is_h3() gate, and nothing in this codebase
nests diffusion_model in a wrapper that could trigger a false positive
today. Recorded as a one-line limit rather than left implicit, per the
round's only (non-blocking) suggestion.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>